Fixators for bone stabilization and associated systems and methods
The present technology relates generally to ring fixators and associated systems and methods. In some embodiments, for example, a ring fixator assembly comprises a ring configured to surround a fractured bone, a retention device disposed at a first position on the ring, and a tensioner clamp disposed at a second position on the ring. A wire extends between the retention device and the tensioner clamp. The tensioner clamp includes a first screw configured to secure the wire in position with respect to the tensioner clamp and a second screw configured to apply additional tension to the wire.
1. A ring fixator assembly comprising:
a ring configured to surround a bone;
a spacer coupled to the ring and extending radially inwardly from the ring, the spacer configured to engage a patient's anatomy when the ring is positioned around a patient's limb;
a retention device disposed at a first position on the ring;
a tensioner clamp disposed at a second position on the ring; and
a wire extending between the retention device and the tensioner clamp,
wherein the tensioner clamp comprises a clamping member configured to secure the wire in position with respect to the tensioner clamp and a tensioning member configured to apply tension to the wire.
2. The ring fixator assembly of claim 1 , wherein the clamping member comprises a clamping screw and wherein the tensioning member comprises a tensioning screw, and wherein the clamping screw and the tensioning member are configured to be controlled by a single driver.
3. The ring fixator assembly of claim 1 , wherein the tensioner clamp comprises a housing surrounding a clamping assembly, the clamping assembly comprising:
a collet housing; and
a collet received at least partially within the collet housing,
wherein the wire passes through a central opening in the collet,
wherein the clamping member comprises a clamping screw threadably engaged with the collet such that rotation of the clamping screw causes the collet to be drawn into the collet housing, thereby clamping the wire, and
wherein the tensioning member comprises a tensioning screw threadably engaged with the housing and coupled to the clamping assembly such that rotation of the tensioning screw causes the clamping assembly to be drawn away from the retention device, thereby applying tension to the wire.
4. The ring fixator assembly of claim 3 , wherein the collet comprises a compressible end portion that compresses when drawn into the collet housing, thereby clamping the wire.
5. The ring fixator assembly of claim 3 , wherein the tensioning screw is coaxial with the clamping screw.
6. The ring fixator assembly of claim 1 , wherein the tensioner clamp comprises a housing surrounding a clamping assembly, the clamping assembly comprising:
a clamp body with a central opening that receives the wire therethrough; and
an aperture in the clamp body, the aperture transverse to the central opening,
wherein the clamping member comprises a set screw threadably received in the aperture such that rotation of the set screw applies pressure to the wire, thereby clamping the wire within the clamp body, and
wherein the tensioning member comprises a tensioning nut threadably engaged with the clamping assembly and coupled to the housing such that rotation of the tensioning nut causes the clamping assembly to be drawn away from the retention device, thereby applying tension to the wire.
7. The ring fixator assembly of claim 6 , further comprising a spring within the housing and surrounding a portion of the clamp body, the spring configured to urge the clamp body away from the tensioning screw.
8. The ring fixator assembly of claim 1 , wherein the ring comprises:
a first ring portion;
a second ring portion; and
a quick-connect assembly that releasably couples the first ring portion to the second ring portion.
9. The ring fixator assembly of claim 8 , wherein the quick-connect assembly comprises first magnetic features disposed on ends of the first ring portion and second magnetic features disposed on ends of the second ring portion, the first and second magnetic features configured to be magnetically joined together.
10. A ring fixator assembly comprising:
a ring configured to surround a bone;
a spacer coupled to the ring and extending radially inwardly from the ring, the spacer configured to engage a patient's anatomy when the ring is positioned around a patient's limb, and
a tensioner clamp, wherein the tensioner clamp comprises:
a central passage configured to receive a wire therein;
a clamping member configured to secure the wire in position within the central passage; and
a tensioning member configured to apply tension to the wire after the clamping member has secured the wire in position.
11. The ring fixator assembly of claim 10 , wherein the clamping member comprises a clamping screw and wherein the tensioning member comprises a tensioning screw, and wherein the clamping screw and the tensioning screw are configured to be controlled by a single driver.
12. The ring fixator assembly of claim 10 , wherein the tensioner clamp comprises a housing surrounding a clamping assembly, the clamping assembly comprising:
a collet housing; and
a collet received at least partially within the collet housing,
wherein the wire passes through a central opening in the collet,
wherein the clamping member comprises a clamping screw threadably engaged with the collet such that rotation of the clamping screw causes the collet to be drawn into the collet housing, thereby clamping the wire.
13. The ring fixator assembly of claim 12 , wherein the tensioning member comprises a tensioning screw threadably engaged with the housing and coupled to the clamping assembly such that rotation of the tensioning screw causes the clamping assembly to be drawn away from the retention device, thereby applying tension to the wire.
14. The ring fixator assembly of claim 12 , wherein the collet comprises a compressible end portion that compresses when drawn into the collet housing, thereby clamping the wire.
15. The ring fixator assembly of claim 14 , wherein the compressible end portion comprises flared portions separated by gaps.
16. The ring fixator assembly of claim 12 , wherein the tensioning screw is coaxial with the clamping screw.
17. The ring fixator assembly of claim 10 , wherein the tensioner clamp comprises a housing surrounding a clamping assembly, the clamping assembly comprising:
a clamp body with a central opening that receives the wire therethrough; and
an aperture in the clamp body, the aperture transverse to the central opening, wherein the clamping member comprises a set screw threadably received in the aperture such that rotation of the set screw applies pressure to the wire, thereby clamping the wire within the clamp body.
18. The ring fixator assembly of claim 17 , wherein the tensioning member comprises a tensioning nut threadably engaged with the clamping assembly and coupled to the housing such that rotation of the tensioning nut causes the clamping assembly to be drawn away from the retention device, thereby applying tension to the wire.
19. The ring fixator assembly of claim 18 , further comprising a spring within the housing and surrounding a portion of the clamp body, the spring configured to urge the clamp body away from the tensioning nut.